... red Specifications: Output Power: 28W Frequency Response: 50HZ ~ 10,000 HZ + 1dbConsumption Current: 150mAVoltage: DC 7.5 ... -stage performance, teacher guide and so on. Function:1,with USB,TF,MP3 input2,FM radio with ... level under 0.5 percent, the level in which any distortion the amplifier introduces becomes inaudible ... ROHS,CE,ISO 9001 certificate Portable Multi-function Remote Control Megaphone GP955R